[PATCH 6/6] watch_maildir: ignore Trash and Drafts, support Dovecot

[Eric Wong <e@80x24.org>]

Trashed messages and drafts are probably not intended for
importing, so do not import them.  Dovecot uses extra flags via
lowercase letters, so we must support those (as that's the
server I use).
---
 lib/PublicInbox/WatchMaildir.pm | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/lib/PublicInbox/WatchMaildir.pm b/lib/PublicInbox/WatchMaildir.pm
index 72bd3d0..b25704e 100644
--- a/lib/PublicInbox/WatchMaildir.pm
+++ b/lib/PublicInbox/WatchMaildir.pm
@@ -1,5 +1,8 @@
 # Copyright (C) 2016 all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+#
+# ref: https://cr.yp.to/proto/maildir.html
+#	http://wiki2.dovecot.org/MailboxFormat/Maildir
 package PublicInbox::WatchMaildir;
 use strict;
 use warnings;
@@ -89,7 +92,7 @@ sub _try_fsn_paths {
 
 sub _remove_spam {
 	my ($self, $path) = @_;
-	$path =~ /:2,[A-R]*S[T-Z]*\z/ or return;
+	$path =~ /:2,[A-R]*S[T-Z]*\z/i or return;
 	my $mime = _path_to_mime($path) or return;
 	_force_mid($mime);
 	foreach my $inbox (values %{$self->{mdmap}}) {
@@ -127,7 +130,11 @@ sub _force_mid {
 sub _try_path {
 	my ($self, $path) = @_;
 	my @p = split(m!/+!, $path);
-	return unless $p[-1] =~ /\A[a-zA-Z0-9][\w:,=\.]+\z/;
+	return if $p[-1] !~ /\A[a-zA-Z0-9][\w:,=\.]+\z/;
+	if ($p[-1] =~ /:2,([A-Z]+)\z/i) {
+		my $flags = $1;
+		return if $flags =~ /[DT]/; # no [D]rafts or [T]rashed mail
+	}
 	return unless -f $path;
 	if ($path !~ $self->{mdre}) {
 		warn "unrecognized path: $path\n";